✨ Set up Copilot instructions

.github/copilot-instructions.md

@@ -2,6 +2,31 @@
 
 This project (Hye Ararat) is a web app that allows users to manage system/app containers and VMs. It is built on Next.js and drives the Incus API.
 
+## Build, Lint, and Format Commands
+
+```bash
+# Install dependencies
+bun install
+
+# Development server
+bun run dev
+
+# Production build
+bun run build
+
+# Start production server
+bun run start
+
+# Lint the codebase
+bun run lint
+
+# Format code with Prettier
+bun run format
+
+# Check formatting without modifying files
+bun run format:check
+```
+
 ## Folder Structure
 
 - Files are in the nearest shared parent of all consumers.
@@ -42,3 +67,43 @@ When creating new API functionality, follow this structure based on the highest-
 - Tailwind CSS for the frontend
 - shadcn/ui based components in `app/_components/ui`
 - swr for data fetching
+- zod for schema validation
+- react-hook-form for form management
+
+## Data Fetching Patterns
+
+### API Functions
+
+Use the `jsonFetcher` utility from `app/_lib/fetcher.ts` for all Incus API calls:
+
+```typescript
+import { jsonFetcher } from '@/app/_lib/fetcher';
+
+export async function getResource() {
+  return jsonFetcher('/1.0/resource').then(
+    (data) => data.metadata as ResourceType,
+  );
+}
+```
+
+### SWR Hooks
+
+Create custom hooks using SWR for data fetching with caching:
+
+```typescript
+import useSWR from 'swr';
+import { getResource } from '../_lib/resource';
+
+export function useResource() {
+  return useSWR('/1.0/resource', getResource);
+}
+```
+
+## Coding Conventions
+
+- Use TypeScript for all new files
+- Define types in separate `.d.ts` files alongside implementation files
+- Use single quotes for strings (enforced by Prettier)
+- Use semicolons (enforced by Prettier)
+- Prefer named exports over default exports for API functions and hooks
+- Use `@/` path alias for imports from the `app` directory